A clamping claw and pipe bending machine

Abstract

The present invention relates to the technical field of pipe processing equipment, and discloses a clamping jaw and a pipe bending machine. The clamping jaw has a first direction and a second direction perpendicular to each other, and includes a fixed clamping block and a movable clamping block. The fixed clamping block and the movable clamping block cooperate with each other in a stop manner along the first direction; the clamping jaw also includes a positioning pin, the positioning pin includes a positioning section, an assembly section, and a fixed section. The movable clamping block has a guide groove extending along the second direction. The positioning section is used to be inserted into the guide groove along the first direction, the assembly section is used to fix a bolt hole installed in a flange, and the fixed section is used to install a fastening nut. The movable clamping block clamps the flange along the second direction, and the fastener can be removed to replace the movable clamping block that matches the flange specification; the positioning section of the positioning pin is installed in the guide groove of the movable clamping block to position the bolt hole of the flange, thereby simplifying the bolt hole positioning method; during the process of pipe loading and bending, the positioning pin and the fastener are free of axial tensile load, and can be quickly installed and replaced without tools, making the replacement of the clamping jaw simple and quick.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe processing equipment, in particular to a clamping claw and a pipe bending machine. Background Art

[0002] Pipe bending machines are commonly used equipment in shipyards for pipe processing. The welding-before-bending process is adopted when processing ship pipes. That is, the pipe and flange are first welded and assembled, and then the pipe is bent on the pipe bending machine. At this time, the clamping jaws of the rear chuck of the pipe bending machine are required to clamp the flange and locate the flange bolt holes to control the rotation of the rear chuck so that the bolt holes of the finished product are positioned correctly.

[0003] Existing pipe bending machines all use hydraulic self-centering chucks. The hydraulic chucks have short jaw travel, requiring jaw replacement for flanges of varying specifications. The jaws require multiple bolts for fastening. Frequent jaw replacement is necessary in shipbuilding production, and existing designs cannot meet the requirements for rapid replacement.

[0004] Early pipe bending machines positioned flange bolt holes by creating a T-slot on the chuck and attaching a T-slide. The slide was then fitted with a locating pin. The T-slide was adjusted and tightened to accommodate flanges of varying specifications. Accurately adjusting the T-slide to the correct position was cumbersome, and inaccurate adjustments led to interference during the clamping process. Furthermore, aligning the pipe feeder with the locating pin was difficult, making this design difficult. Consequently, most pipe bending machine manufacturers have abandoned this approach. Currently, most pipe bending machines use laser scanning or photography to locate flange bolt holes, but these methods often require complex mechanisms and control systems, resulting in high costs and slow positioning. Summary of the Invention

[0005] The purpose of the present invention is to provide a clamping claw to solve the problems of inconvenient replacement of clamping claws of pipe bending machines, troublesome positioning of flange bolt holes and high cost in the prior art; the present invention also provides a pipe bending machine using the clamping claw.

[0006] To achieve the above-mentioned object, the present invention provides a clamping jaw, the clamping jaw having a first direction and a second direction perpendicular to each other, the clamping jaw comprising a fixed clamping block and a movable clamping block, the fixed clamping block being used to be fixedly assembled on the chuck of the pipe bender, the fixed clamping block and the movable clamping block being engaged with each other in a stop along the first direction, a fastener extending in the second direction being provided between the movable clamping block and the fixed clamping block, the movable clamping block being used to clamp a flange in the second direction, and the movable clamping block being engaged with the flange in a stop along the first direction;

[0007] It also includes a positioning pin, which includes a positioning section, an assembly section and a fixing section. The assembly section is located between the positioning section and the fixing section. The movable clamp has a guide groove extending along the second direction. The positioning section is used to be inserted into the guide groove along the first direction. The assembly section is used to fix the bolt hole installed in the flange. The fixing section is used to assemble the fastening nut.

[0008] Preferably, the fixed clamp includes a first plate surface, a second plate surface and a third plate surface, the first plate surface and the third plate surface are arranged parallel to each other, the second plate surface is vertically connected between the first plate surface and the third plate surface, and an accommodating space for accommodating the movable clamp is formed between the first plate surface and the third plate surface, the first plate surface and the third plate surface are both engaged with the movable clamp along the first direction stop, and the fastener is assembled on the second plate surface.

[0009] Preferably, coaxially arranged fixing screw holes are provided on the second plate surface and the movable clamping block, the fixing screw holes extend along the second direction, and the fixed clamping block and the movable clamping block are detachably assembled by screws.

[0010] Preferably, the movable clamp includes a stop plate and an assembly plate, the stop plate cooperates with the first plate surface to stop along the first direction, the assembly plate is perpendicular to the assembly plate, the end of the assembly plate away from the stop plate cooperates with the third plate surface to stop along the first direction, the side of the assembly plate facing away from the second plate surface has a clamping surface for clamping the flange along the second direction, the clamping surface is a circular arc surface, and the fixing screw hole is provided on the assembly plate.

[0011] Preferably, a step is provided at one end of the assembly plate away from the stop plate, and the step cooperates with the third plate surface stop.

[0012] Preferably, a stop platform is formed on a side of the stop plate away from the assembly plate, the thickness of the stop platform is greater than the thickness of the stop plate, and the stop platform is used to cooperate with the flange stop.

[0013] Preferably, the diameter of the assembly section is equal to the diameter of the bolt hole of the flange, the diameter of the positioning section is equal to the diameter of the guide groove, the diameter of the assembly section is larger than the diameter of the positioning section, and the diameter of the assembly section is larger than the diameter of the fixing section.

[0014] Preferably, a flange is formed at one end of the assembly section close to the positioning section, and the flange is a semicircular structure.

[0015] The present invention also provides a pipe bending machine, comprising a chuck, wherein the chuck is provided with a plurality of claws, and at least one of the claws is the claw described in any of the aforementioned technical solutions.

[0016] Compared with the prior art, the clamping jaw and pipe bending machine of the embodiment of the present invention have the following advantages: the clamping jaw is divided into a fixed clamping block and a movable clamping block, and the movable clamping block and the fixed clamping block are assembled by fasteners, and the flange is clamped in the second direction by the movable clamping block. When the specifications of the flange change, the fasteners can be removed and replaced with movable clamping blocks that match the flange specifications to clamp flanges of different specifications; the assembly section of the locating pin is fixedly installed in the bolt hole of the flange, and the positioning section of the locating pin is installed in the guide groove of the movable clamping block to position the bolt hole of the flange, and the guide groove extends along the second direction, and the locating pin can be installed in the second direction. It can be moved to accommodate flanges with radial deviations in bolt holes, and at the same time locate the circumferential positions of the bolt holes, which has strong applicability and simplifies the bolt hole positioning method; since the movable clamping block cooperates with the flange to stop along the first direction, and the movable clamping block cooperates with the fixed clamping block to stop along the first direction, during the process of pipe loading and bending, the axial force of the flange is borne by the movable clamping block and the fixed clamping block, and the locating pins and fasteners have no axial tensile load, so the locating pins and fasteners can be quickly installed and replaced without tools, and replacing the clamping claws is simple and quick, and does not require complex and expensive laser scanning, servo control systems, etc., and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the state of the clamping claws of the present invention when clamping and fixing the flange and the pipe;

[0018] Figure 2 yes Figure 1 Left view of;

[0019] Figure 3 It is a structural schematic diagram of the fixed clamping block of the clamping claw of the present invention;

[0020] Figure 4 yes Figure 3 Left side view of the fixing clamp;

[0021] Figure 5 2. It is a structural schematic diagram of the movable clamping block of the clamping jaw of the present invention;

[0022] Figure 6 yes Figure 5 The left side view of the movable clamp;

[0023] Figure 7 It is a structural schematic diagram of the positioning pin of the clamping claw of the present invention;

[0024] Figure 8 yes Figure 7 Right side view of the positioning pin;

[0025] Figure 9 It is a schematic diagram of the assembly process of the fixed clamping block and the movable clamping block of the clamping claw of the present invention when working;

[0026] Figure 10This is a schematic diagram of the assembly process of the flange and the positioning pin when the claw of the present invention is working;

[0027] Figure 11 This is a schematic diagram of the process of assembling the flange and the claw during operation of the claw of the present invention;

[0028] Figure 12 It is a schematic diagram of the process of the clamping claws of the present invention radially clamping the flange during operation.

[0029] In the figure, 1. fixed clamp, 11. first plate surface, 12. second plate surface, 13. third plate surface, 2. movable clamp, 21. guide groove, 22. stop plate, 23. assembly plate, 24. step platform, 25. stop platform, 3. positioning pin, 31. positioning section, 32. assembly section, 33. fixed section, 34. flange, 4. fastener, 5. fixing screw hole, 6. flange, 61. bolt hole, 7. pipe, 8. fastening nut. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] A preferred embodiment of a claw of the present invention is as follows Figures 1 to 12 As shown, the claw has a first direction and a second direction perpendicular to each other. In this embodiment, when the claw is assembled on the chuck of the pipe bending machine to fix the flange 6, the first direction of the claw is the axial direction of the flange 6, and the second direction is the radial direction of the flange 6.

[0032] The clamping jaws include a fixed clamping block 1 and a movable clamping block 2. The fixed clamping block 1 is used to be fixedly assembled on the clamping head of the pipe bender. Once fixed, the fixed clamping block 1 does not need to be disassembled and replaced due to different specifications of the flange 6. A fastener 4 is also provided between the movable clamping block 2 and the fixed clamping block 1. The fastener 4 extends along the second direction, that is, the fastener 4 connects and assembles the fixed clamping block 1 and the movable clamping block 2 along the radial direction of the flange 6. The movable clamping block 2 and the fixed clamping block 1 are detachably assembled by the fastener 4, and the corresponding movable clamping block 2 can be replaced when the specifications of the flange 6 are different.

[0033] The movable clamp 2 is used to clamp the fixed flange 6 along the second direction, that is, when the chuck drives the claw to move radially along the flange 6, the movable clamp 2 clamps the flange 6 along the radial direction of the flange 6 to prevent the flange 6 from moving. The fixed clamp 1 and the movable clamp 2 cooperate with each other in the first direction, and the movable clamp 2 cooperates with the flange 6 in the first direction. When assembling the flange 6, the movable clamp 2 is attached to the sealing surface of the flange 6, and the movable clamp 2 is located between the fixed clamp 1 and the flange 6. When the pipe 7 is assembled with the flange 6, the axial force applied to the flange 6 along the first direction is directly transmitted to the fixed clamp 1 via the movable flange 6. The fastener 4 does not bear the axial force, which facilitates the disassembly and replacement of the fastener 4.

[0034] The claw also includes a positioning pin 3, which includes a positioning section 31, an assembly section 32, and a fixing section 33. The assembly section 32 is located between the positioning section 31 and the fixing section 33, and the positioning section 31, the assembly section 32, and the fixing section 33 are arranged sequentially along a first direction. The assembly section 32 is configured to be fixedly installed within the bolt hole 61 of the flange 6. The outer wall of the assembly section 32 mates with the inner wall of the bolt hole 61 of the flange 6, so that the assembly section 32 and the bolt hole 61 are coaxial. The fixing section 33 is configured to be assembled with a fastening nut 8, which connects the positioning pin 3 to the flange 6 along the first direction, thereby assembling and fixing the positioning pin 3.

[0035] The movable clamp 2 also has a guide slot 21 extending along the second direction. In this embodiment, the guide slot 21 is U-shaped, with an open bottom. The positioning segment 31 is inserted into the guide slot 21 along the first direction. The guide slot 21 allows the positioning segment 31 to move in the second direction, adapting to flanges 6 having the same outer diameter but different bolt hole 61 positions. In this embodiment, the guide slot 21 of various sizes of movable clamps 2 has the same width, which reduces the size of the guide pins.

[0036] The outer wall of the positioning section 31 cooperates with the groove wall of the guide groove 21 to form a circumferential stop along the flange 6, preventing the positioning section 31 from moving circumferentially within the guide groove 21, thereby ensuring that the positioning direction of the bolt hole 61 remains unchanged, thereby achieving the circumferential positioning of the bolt hole 61 along the flange 6. The positioning pin 3 is inserted into the bolt hole 61 of the flange 6 and secured by tightening the nut 8. The positioning pin 3 itself does not bear the axial force of the flange 6, so it can be quickly installed without tools.

[0037] The clamping claw is divided into a fixed clamping block 1 and a movable clamping block 2, and the movable clamping block 2 is assembled with the fixed clamping block 1 by a fastener 4, and the movable clamping block 2 is used to clamp the flange 6 along the second direction. When the specifications of the flange 6 change, the fastener 4 can be removed and replaced with the movable clamping block 2 that matches the specifications of the flange 6 to clamp flanges 6 of different specifications; the assembly section 32 of the locating pin 3 is fixedly mounted in the bolt hole 61 of the flange 6, and the positioning section 31 of the locating pin 3 is mounted in the guide groove 21 of the movable clamping block 2 to position the bolt hole 61 of the flange 6. The guide groove 21 extends along the second direction, and the locating pin 3 can move along the second direction to accommodate the bolt The flange 6 has a radial deviation in the hole 61, and the circumferential position of the bolt hole 61 is positioned at the same time, which has strong applicability and simplifies the positioning method of the bolt hole 61; since the movable clamp 2 and the flange 6 are stopped along the first direction, and the movable clamp 2 and the fixed clamp 1 are stopped along the first direction, during the feeding and bending of the pipe 7, the axial force of the flange 6 is borne by the movable clamp 2 and the fixed clamp 1, and the locating pin 3 and the fastener 4 have no axial tensile load, so the locating pin 3 and the fastener 4 can be quickly installed and replaced without tools, and the replacement of the clamping claws is simple and quick, and there is no need for complex and expensive laser scanning, servo control systems, etc., and the cost is low.

[0038] Preferably, the fixed clamp 1 includes a first plate surface 11, a second plate surface 12 and a third plate surface 13. The first plate surface 11 and the third plate surface 13 are arranged in parallel and spaced apart. The second plate surface 12 is vertically connected between the first plate surface 11 and the third plate surface 13. An accommodating space for accommodating the movable clamp 2 is formed between the first plate surface 11 and the third plate surface 13. The first plate surface 11 and the third plate surface 13 are both engaged with the movable clamp 2 along the first direction stop, and the fastener 4 is assembled on the second plate surface 12.

[0039] The first plate surface 11 of the fixed clamp 1 is used to be fixed on the chuck of the pipe bending machine and can be driven by the chuck to move radially along the flange 6. The accommodating space between the third plate surface 13 and the first plate surface 11 can be used to install the movable clamp 2. The end surfaces of the first plate surface 11 and the second plate surface 12 facing each other are both fitted with the movable clamp 2 along the first direction, thereby cooperating with the stopper of the movable clamp 2 to transfer the axial tensile load on the movable clamp 2 to the fixed clamp 1, and then to the chuck, thereby preventing the fastener 4 from being subjected to stress.

[0040] Fastener 4 is assembled on second plate surface 12. Since second plate surface 12 perpendicularly connects first plate surface 11 and second plate surface 12, it ensures that fastener 4 extends in the second direction, protecting fastener 4 from axial tensile loads. In this embodiment, first plate surface 11 and third plate surface 13 are both fan-shaped structures, while second plate surface 12 is an arc-shaped structure extending along the circumference of flange 6. Second plate surface 12 fits snugly against movable clamping block 2 to transmit radial clamping force, ensuring that fastener 4 is only subjected to tightening force, preventing movable clamping block 2 from falling off and facilitating quick, tool-free replacement.

[0041] Preferably, coaxially arranged fixing screw holes 5 are provided on the second plate surface 12 and the movable clamping block 2 , and the fixing screw holes 5 extend along the second direction. The fasteners 4 include screws, and the fixed clamping block 1 and the movable clamping block 2 can be detachably assembled by screws.

[0042] The fastener 4 is formed by a screw, and the second plate surface 12 and the movable clamping block 2 are assembled and disassembled by the screw, which simplifies the structure of the fastener 4. The screw is not subjected to axial tension, and fastening and disassembly are convenient.

[0043] Preferably, the movable clamp 2 includes a stop plate 22 and an assembly plate 23, the stop plate 22 cooperates with the first plate surface 11 to stop along the first direction, the assembly plate 23 is perpendicular to the assembly plate 23, and the end of the assembly plate 23 away from the stop plate 22 cooperates with the third plate surface 13 to stop along the first direction, and the side of the assembly plate 23 facing away from the second plate surface 12 has a clamping surface for clamping the flange 6 along the second direction, the clamping surface is a circular arc surface, and the fixing screw hole 5 is provided on the assembly plate 23.

[0044] The movable clamp 2 is formed by a stop plate 22 and an assembly plate 23. The stop plate 22 is attached to the first plate surface 11 of the fixed clamp 1, and the assembly plate 23 is attached to the second plate surface 12 and the third plate surface 13 of the fixed clamp 1. The assembly plate 23 and the stop plate 22 are respectively stopped and cooperated with the third plate surface 13 and the first plate surface 11, which simplifies the stop cooperation form between the movable clamp 2 and the fixed clamp 1. At the same time, a accommodating space for the flange 6 is also formed between the assembly plate 23 and the stop plate 22.

[0045] The clamping surface of the assembly plate 23, facing away from the second plate surface 12, is a circular arc surface. This surface can closely mate with the end face of the flange 6, radially clamping and securing the flange 6. As the specifications of the flange 6 change, the radius R of the clamping surface can be customized to suit the outer diameter of the flange 6 of different specifications. The corresponding movable clamping block 2 can be replaced based on the radius R of the clamping surface to match the flange 6 of the corresponding outer diameter.

[0046] Preferably, a step platform 24 is provided at one end of the assembly plate 23 away from the stop plate 22 , and the step platform 24 is engaged with the third plate surface 13 for stopping.

[0047] A stepped platform 24 is provided on the assembly plate 23. When the movable clamp 2 and the fixed clamp 1 are assembled along the second direction, the stepped platform 24 has a guiding function to ensure that the movable clamp 2 and the fixed clamp 1 are tightly fitted. After fitting, the movable clamp 2 can withstand the axial tension during the bending process and transmit the axial tension to the fixed clamp 1.

[0048] Preferably, a stop platform 25 is formed on one side of the stop plate 22 away from the assembly plate 23 . The thickness of the stop platform 25 is greater than the thickness of the stop plate 22 . The stop platform 25 is used to cooperate with the flange 6 for stopping.

[0049] The molding thickness of one side of the support plate is greater than the stop platform 25 of the stop plate 22. The stop platform 25 contacts the sealing surface of the flange 6 and serves as the positioning basis of the flange 6 along the first direction. The structural size control of the movable clamp 2 makes the positioning reference of flanges 6 and pipes 7 of all specifications the same, which can simplify the control system.

[0050] Preferably, the diameter of the assembly section 32 is equal to the diameter of the bolt hole 61 of the flange 6 , the diameter of the positioning section 31 is equal to the diameter of the guide groove 21 , the diameter of the assembly section 32 is greater than the diameter of the positioning section 31 , and the diameter of the assembly section 32 is greater than the diameter of the fixing section 33 .

[0051] The diameters of the assembly section 32 and the bolt hole 61 are the same. After the assembly section 32 is inserted into the bolt hole 61, the assembly section 32 and the bolt hole 61 can be ensured to fit tightly together to achieve coaxiality, thereby improving the positioning accuracy of the bolt hole 61. The diameter of the positioning section 31 is equal to the diameter of the guide groove 21. After the positioning section 31 is inserted into the guide groove 21 along the first direction, the outer wall of the positioning section 31 is in close contact with the groove wall of the guide groove 21, and the circumference of the positioning section 31 can be accurately positioned, thereby improving the positioning accuracy.

[0052] The diameters of both the fixing section 33 and the positioning section 31 are smaller than the diameter of the assembly section 32, facilitating insertion of the positioning pin 3 into the bolt hole 61 of the flange 6 along the first direction. In this embodiment, a negative tolerance is established between the diameter of the positioning section 31 and the width of the guide groove 21, and a negative tolerance is established between the diameter of the assembly section 32 and the diameter of the bolt hole 61, facilitating assembly and disassembly.

[0053] Preferably, a flange 34 is formed at one end of the assembly section 32 close to the positioning section 31 , and the flange 34 is a semicircular structure.

[0054] After the locating pin 3 is inserted into the bolt hole 61 of the flange 6, the flange 34 contacts the sealing surface of the flange 6. The flange 34 can withstand the axial impact force during loading and also axially limit the locating pin 3. The raised sealing surface of some flanges 6 is very close to the edge of the bolt hole 61. The flange 34 has a semicircular structure. When the locating pin 3 is assembled with the flange 6, the flange 34 is installed away from the center of the flange 6 to avoid interference between the flange 34 and the raised sealing surface of the flange 6.

[0055] The present invention also provides a preferred embodiment of a pipe bending machine, comprising a chuck having a plurality of jaws, at least one of which is a jaw in any of the above embodiments. In this embodiment, the chuck can be a three-jaw or four-jaw self-centering chuck.

[0056] The working process of the present invention is:

[0057] S1, such as Figure 9As shown, the fixed clamping block 1 is fixedly assembled on the clamping head of the pipe bending machine, and the movable clamping block 2 is installed into the accommodating space of the fixed clamping block 1. The stop plate 22 of the movable clamping block 2 is in contact with the first plate surface 11 of the fixed clamping block 1. The movable clamping block 2 is pushed in the second direction and clamped into the fixed clamping block 1. The movable clamping block 2 is rotated to align with the fixing screw hole 5, and the screw is screwed in to fix the movable clamping block 2 and the fixed clamping block 1 in position.

[0058] S2, such as Figure 10 As shown, insert the locating pin 3 into any bolt hole 61 of the flange 6, the flange 34 of the locating pin 3 fits with the flange 6, the assembly section 32 is located in the bolt hole 61, and the fastening nut 8 is screwed on the fixing section 33 to fix it;

[0059] S3, such as Figure 11 As shown, the chuck angle of the pipe bender is reset and placed at 0, the chuck is opened, the flange 6 is pushed into the chuck along the first direction, the positioning section 31 of the positioning pin 3 is aligned with the movable clamping block 2, and the flange 6 is rotated after the positioning section 31 contacts the movable clamping block 2. The positioning section 31 falls into the guide groove 21, and the pipe 7 is pushed along the first direction so that the end face of the flange 6 is in close contact with the stopper 25 of the movable clamping block 2;

[0060] S4, such as Figure 12 As shown, the pipe bending machine is instructed to clamp the flange 6, the claw moves along the second direction, the positioning section 31 moves along the second direction in the guide groove 21, and the assembly plate 23 of the movable clamping block 2 fits with the end face of the flange 6 to achieve clamping along the second direction.

[0061] In summary, the embodiment of the present invention provides a clamping jaw and a pipe bending machine, which divides the clamping jaw into a fixed clamping block and a movable clamping block, and the movable clamping block and the fixed clamping block are assembled by fasteners, and the movable clamping block is used to clamp the flange along the second direction. When the specifications of the flange change, the fasteners can be removed and replaced with movable clamping blocks that match the flange specifications to clamp flanges of different specifications; the assembly section of the locating pin is fixedly installed in the bolt hole of the flange, and the positioning section of the locating pin is installed in the guide groove of the movable clamping block to position the bolt hole of the flange. The guide groove extends along the second direction, and the locating pin can move along the second direction. It can accommodate flanges with radial deviations in bolt holes and simultaneously locate the circumferential positions of the bolt holes. It has strong applicability and simplifies the bolt hole positioning method. Since the movable clamping block cooperates with the flange in the first direction stop, and the movable clamping block cooperates with the fixed clamping block in the first direction stop, during the process of pipe loading and bending, the axial force of the flange is borne by the movable clamping block and the fixed clamping block, and the locating pins and fasteners have no axial tensile load. Therefore, the locating pins and fasteners can be quickly installed and replaced without tools, and the replacement of the clamping claws is simple and quick, and does not require complex and expensive laser scanning, servo control systems, etc., and the cost is low.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A claw, characterized in that: The clamping jaw has a first direction and a second direction perpendicular to each other, and the clamping jaw includes a fixed clamping block (1) and a movable clamping block (2), the fixed clamping block (1) is used for being fixedly assembled on the clamping head of the pipe bending machine, the fixed clamping block (1) and the movable clamping block (2) are engaged in a stop along the first direction, a fastener (4) extending in the second direction is provided between the movable clamping block (2) and the fixed clamping block (1), the movable clamping block (2) is used for clamping the flange (6) along the second direction, the movable clamping block (2) and the flange (6) are engaged in a stop along the first direction, the first direction is the axial direction of the flange (6), and the second direction is the radial direction of the flange (6); The movable clamping block (2) further comprises a positioning pin (3), the positioning pin (3) comprising a positioning section (31), an assembly section (32) and a fixing section (33), the assembly section (32) being located between the positioning section (31) and the fixing section (33), the movable clamping block (2) having a guide groove (21) extending along a second direction, the positioning section (31) being used for being inserted into the guide groove (21) along a first direction, the assembly section (32) being used for fixing a bolt hole (61) which is installed in the flange (6), and the fixing section (33) being used for assembling a fastening nut (8).

2. The claw according to claim 1, characterized in that The fixed clamp (1) includes a first plate surface (11), a second plate surface (12) and a third plate surface (13), the first plate surface (11) and the third plate surface (13) are arranged in parallel and spaced apart, the second plate surface (12) is vertically connected between the first plate surface (11) and the third plate surface (13), and an accommodating space for accommodating the movable clamp (2) is formed between the first plate surface (11) and the third plate surface (13), the first plate surface (11) and the third plate surface (13) are both engaged with the movable clamp (2) along a first direction stop, and the fastener (4) is assembled on the second plate surface (12).

3. The claw according to claim 2, characterized in that: The second plate surface (12) and the movable clamping block (2) are provided with coaxially arranged fixing screw holes (5), the fixing screw holes (5) extending along the second direction, the fasteners (4) comprising screws, and the fixing clamping block (1) and the movable clamping block (2) are detachably assembled by means of the screws.

4. The claw according to claim 3, characterized in that The movable clamp (2) includes a stop plate (22) and an assembly plate (23), wherein the stop plate (22) is engaged with the first plate surface (11) in a stop manner along a first direction, and the assembly plate (23) is perpendicular to the stop plate (22), and an end of the assembly plate (23) away from the stop plate (22) is engaged with the third plate surface (13) in a stop manner along a first direction, and a side of the assembly plate (23) away from the second plate surface (12) has a clamping surface for clamping the flange (6) in a second direction, and the clamping surface is an arc surface, and the fixing screw hole (5) is provided on the assembly plate (23).

5. The claw according to claim 4, characterized in that: A stepped platform (24) is provided at one end of the assembly plate (23) away from the stop plate (22), and the stepped platform (24) is engaged with the third plate surface (13) for stopping.

6. The claw according to claim 4, characterized in that: A stop platform (25) is formed on one side of the stop plate (22) away from the assembly plate (23). The thickness of the stop platform (25) is greater than the thickness of the stop plate (22). The stop platform (25) is used to cooperate with the flange (6) for stopping.

7. The claw according to any one of claims 1 to 6, characterized in that: The diameter of the assembly section (32) is equal to the diameter of the bolt hole (61) of the flange (6), the diameter of the positioning section (31) is equal to the diameter of the guide groove (21), the diameter of the assembly section (32) is greater than the diameter of the positioning section (31), and the diameter of the assembly section (32) is greater than the diameter of the fixing section (33).

8. The claw according to claim 7, characterized in that A flange (34) is further formed on one end of the assembly section (32) close to the positioning section (31), and the flange (34) is a semicircular structure.

9. A pipe bending machine, comprising a chuck, wherein the chuck is provided with a plurality of claws, characterized in that: At least one of the clamping claws is the clamping claw according to any one of claims 1 to 8.

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